Any person desiring a permit to construct or maintain an elevated sidewalk along or in front of premises owned or controlled by any such person shall file a written petition therefor with the Board, specifying the location of such elevated sidewalk and the purpose for which the same is to be constructed or maintained. The Board shall thereupon consider said petition and grant the same, if, upon such consideration, it shall find that such elevated sidewalk will be in accordance with the public interest or convenience.